Boiler.



PATENTED 00T. 11,1904.

` E. G. RUST.

BOILBR.

APPLIGATION FILED APB.. 28, 1904.

3 SHEETS-SHEET l.

N0 MODEL.

N0.772,297. PATENTBD 00T. 11.1904.

E. G. RUST.

BOILER.

APPLICATION FILED un. ze, 1904.

N0 MODEL. a SHEETS-SHEET 2.

MQ' I I P ATNTBD OCT. `11, 1904.

- E. G.- RUST.

Y BOILER. APPLIOATION FILED APB.. 28. 1904.

N0 MODEL, 3 SHEETS-SHEET 3.

UNITED STATES Patented October 11, 1904.

EDWIN GRAI7 RUST, OF ELK RAPIDS, MICHIGAN.

BOILER.

SPECIFICATION forming part of Letters Patent N o. 772,297, dated October11, 1904.

Application tiled April 28, 1904:.

To L66 whom it may concern:

Be it known that I, EDWIN GRAY RUST, a citizen of the United States,residing in Elk Rapids, Michigan, have invented certain Improvements inBoilers, of which the following is a specification.

My invention consists more particularly in certain improvements in thearrangement of the water-tubes extending between two pairs of drumsrelatively to the other partsV of a boiler of the type described andclaimed in Letters Patent of the United States N o. 698,323, issued tome April 22, 1902, and more particularly contemplates such arrangementof the tubes as to form a convenient and reliable support to thebaflie-wall.

The object of my invention is to provide a boiler of durable and compactconstruction, including two upper and two lower drums connected by rowsof water-tubes and heated by products of combustion delivered from afurnace, and in the use of a novel-form of bafflewall to so deflect theproducts of combustion as to secure the best results with a minimumfloor-space, material for construction, and such support for thebaflie-wall as will avoid displacement of same. These objects I attainas hereinafter set forth, reference being had to the accompanyingdrawings, in which- Figure l is a sectional elevation of a wellknowntype of boiler, showing my improved form of baffle-wall between the twomain sets of vertically-extending water-tubes. Fig. 2 is a sectionalelevation on the line 2 2, Fig. 1, further illustrating a modifiedarrangement of my improved boiler; and Fig. 3 is a sectional elevationof a special form of my invention, thev tubes being so arranged as toeliminate the greater portion of the refractory baffle-wall andthemselves perform the function of said wall.

In the above drawings, A represents a casing or setting, which in thepresent instance is provided wit-h a forwardly-extending portion A,serving asa furnace, which is provided with a grate a and a {ire-bricklining c', having in addition fire and ash-pit doors a2 and c3. The rearof said furnace opens directly into the main chamber of the boiler,

Serial No. 205,329. (No model.)

within which are a pair of lower drums B and B' and a pair of upperdrums'D and D', the drums B and D and B and D/ being respectivelyconnected by vertically-eXtending tubes 6 and 6.. In addition there arein each of the fourdrums series of openings, to which are connected twoseries of tubes 62, which are curved at their upper and lower ends so asto enter their respective drums perpendicularly to the curved surfacesthereof. The inain portions of these tubes are straight and extend intwo substantially parallel planes midway between the two sets ofstraight tubes 6 and 6. place a baflie-wall 66, of refractory material,carrying this upon a supporting-wall 67 and eX- tending it to a heightpractically the same as that of the straight portions of said tubes. Bythis construction I provide a substantially gastight wall between thetubes 6.and 6, so that the products of combustion coming from thefurnace pass upwardly and around the tubes 6 and also heat the frontseries of tubes 62. Passing between the curved upper ends of this sameseries of tubes 62 the products of combustion pass downwardly around thetubes 6l and also heat the second or rear series of the tubes 62,between whose upper ends the hot gases pass. At a point adjacent to thelower drum B' all of the gases pass between the tubes 6l and flowaroundthe lower edge of a baie-wall d, between which and the rearportion a5 of the boiler-setting is left a space connected to a suitablestack. Y

In addition to the tubes above noted the drums B and Bv have extendingbetween their adjacent surfaces a series of tubes 6*, while the drums Dand D are also connected by an additional series of tubes 65, therebeing also steam-pipes 6 connected tothe upper portions of said drums inthe well-known manner. If desired, the tubes 62 vinstead of having theirstraight portions lying in two planes may be so placed, as shown -inFig. 3, as to have said portions lying in one plane. With such anarrangement of parts the baiiiewall of refractory material may beomitted and the tubes 62 made to serve as the substantially gas-tightbaflie-wall.

Between these two sets of tubes 62 I Owing to the fact that the tubesconnecting the drums D and Balternate with those connecting the drums D'and B', there are left between the curved upper ends of the two seriesof tubes b2 spaces through which the products of combustion arepermitted to pass in their Vliow from the portion of the boilercontaining the tubes to the part containing the tubes In order that theproducts of combustion may not be short-circuited by the openingsbetween the curved lower ends of the tubes b2, I provide a wall b3. ofrefractory material, which eifectually closes such otherwise open spacesbetween said tubes. In order to more eihciently direct the products ofcombustion, I provide a number of baffles bs, b, and bw for directingthe hot gases as they rise around tubes b, and also other baflies, d3and d4, to further direct said gases in their descent around the tubesd.

I claim as my invention- 1. The combination in a boiler of a furnace,pairs of drums of which each pair has a series of tubes respectivelyconnecting its members, auxiliary series of tubes respectively extendingbetween and entering the drums of each pair, the tubes of said auxiliaryseries extending adjacent to each other, with means for directing theproducts of combustion from the furnace into contact with the auxiliaryseries of tubes, substantially as described.

2. The combination in a boiler of two series of Inain tubes, an upperand a lower drum for each series of tubes and auxiliary series of tubesextending between each pair of drums, said auxiliary series of tubesextending adjacent to each other and forming a substantially gas-tightpartition between said two Inain series of tubes, substantially asdescribed.

3. The combination in a boiler of two lower drums and two upper drumsrespectively above said lower drums, a series of tubes extending betweeneach pair of upper and lower drums, an auxiliary series of tubesextending from each upper drum to its respective lower drinn, saidseries of auxiliary tubes being adjacent to each other and forming forthe greater part of their length a substantially gas-tight partitionbetween the main series of tubes connecting the drums, substantially asdescribed.

4. The combination in a boiler of two upper and two lower drums, aseries of tubes extending from each upper drum to one of the lowerdrums, a series of auxiliary tubes extending between each upper drum andone of the lower drums, said auxiliary tubes being relatively distantfrom the straight tubes and being curved at each end so as to enter thecurved surface of the drums substantially perpendicular thereto, afurnace, with means for directing hot gases from said furnace upwardlyaround one set of straight tubes, across the space including the upperends of the auxiliary tubes and downwardly around the second series ofstraight tubes, substantially as described.

5. The combination of two lower and two upper drums, two series of tubesrespectively connecting the upper with the lower drums, a series oftubes connecting the two lower drums and a second series of tubesconnecting the two upper drums, with auxiliary series of tubesconnecting respectively each of the upper drums with one of the lowerdrums and extending in the space between the straight series of tubes, afurnace and means for directing gas from the furnace in contact with thetubes connecting the upper and lower drums, substantially as described.

6. The combination in a boiler of two lower drums, and two upper drumsrespectively above said lower drums, a series of tubes extending betweeneach pair of upper and lower drums, auxiliary series of tubes extendingfrom the upper drums to their respective lower drums, one of said seriesof auxiliary tubes projecting toward the opposite series of auxiliarytubes, with a baffle-wall of refractory material supported between saidtwo series of auxiliary tubes for defiecting the products of combustion,substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

EDWIN GRAY RUST.

Witnesses:

FREDERICK ELLIS, RICHARD W. BAGOT.

